Starcraft II under wine isn't even playable in SLI mode, it just jitters like crazy like a slideshow in most cases. I know the second card is being used also since the system runs much hotter in SLI mode, yet puts out piss poor framerates.

I get smooth framerates running a single card, and half the heat.
My system is in my sig.

NVIDIA: Please fix SLI mode so its usable, thanks.

Have you tried with the new beta already? 260.19.06 is out due yesterday. They don't mention it is fixed, but hey you never know...